Are all cheap Microsoft keys gray-market?

No. Authorized partners pass on genuine volume and OEM channel discounts every day. The price is not the problem — the unverifiable source is. Apply the five checks above.

Is buying from a third-party reseller legal?

Yes, when the reseller is authorized and the license terms are respected. What is illegal is selling keys obtained by fraud, which is exactly what the checks help you avoid.

What proof should I keep after buying?

The order invoice, the key email and the payment receipt. For business purchases, our B2B service adds compliance documentation suitable for SAM audits .

How fast should a key arrive?

Within minutes of payment confirmation — ten minutes at the outside. If a seller takes days to email a key, their supply chain is worth questioning.

Can Microsoft block a legitimately bought OEM key?

Genuine keys from authorized channels are not blocked. Keys from stolen-card or term-violating sources are — which is why the seller’s supply chain, not the price, is the thing to vet.

Buying Microsoft Keys from Third Parties: Risks and How to Buy Safely